61251621 has 8 divisors (see below), whose sum is σ = 81706080. Its totient is φ = 40815792.

The previous prime is 61251607. The next prime is 61251643. The reversal of 61251621 is 12615216.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61251621 - 2⁶ = 61251557 is a prime.

It is a super-2 number, since 2×61251621² = 7503522150255282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61251591 and 61251600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61251521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7710 + ... + 13488.

It is an arithmetic number, because the mean of its divisors is an integer number (10213260).

Almost surely, 2^61251621 is an apocalyptic number.

It is an amenable number.

61251621 is a deficient number, since it is larger than the sum of its proper divisors (20454459).

61251621 is a wasteful number, since it uses less digits than its factorization.

61251621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9315.

The product of its digits is 720, while the sum is 24.

The square root of 61251621 is about 7826.3414824553. The cubic root of 61251621 is about 394.1902355490.

Adding to 61251621 its reverse (12615216), we get a palindrome (73866837).

The spelling of 61251621 in words is "sixty-one million, two hundred fifty-one thousand, six hundred twenty-one".